6-10) Yatsugatake Geo-Electromagnetic
Observatory
This
is the former Yatsugatake Geomagnetic Observatory, which had been a standard
magnetic observatory in the central part of Japan since 1970. The observatory changed its name to the
Geo-Electromagnetic Observatory in 1994, recognizing the great importance of
electric measurements, as well as magnetic ones, in earthquake prediction
research. Accurate observations of
electric and magnetic fields are taken continuously at the eastern foot of Mt.
Yatsugatake in Nagano Prefecture.
The
observatory acts as a reference station for various kinds of electromagnetic
research in Japan. Meanwhile,
magnetic and electric field variations are continuously monitored at a number
of satellite stations in the Tokai and Izu regions to study crustal activities.
Fig.1.
Satellite electric and magnetic stations (SHN, Fujimiya-Shinosaka;
TAW, Tawaramine; HRN, Haruno; SAG, Sagara) and a resistivity station (OKN,
Okuno) in Tokai and Izu regions.